From 1c219e3de5ce5256c8e46f48ee2dd10a2d6ce659 Mon Sep 17 00:00:00 2001
From: Weston Pace <weston.pace@gmail.com>
Date: Mon, 8 Feb 2021 14:11:57 +0100
Subject: [PATCH] ARROW-11490: [C++] BM_ArrowBinaryDict/EncodeLowLevel is not
 deterministic

Clearing out previous values before generating new data.  This will allow the benchmark to be more consistent when run with benchmark_repetitions

Closes #9411 from westonpace/bugfix/arrow-11490

Authored-by: Weston Pace <weston.pace@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>
---
 cpp/src/parquet/encoding_benchmark.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cpp/src/parquet/encoding_benchmark.cc b/cpp/src/parquet/encoding_benchmark.cc
index 8e409c5e429f6..7c5eafd151305 100644
--- a/cpp/src/parquet/encoding_benchmark.cc
+++ b/cpp/src/parquet/encoding_benchmark.cc
@@ -534,6 +534,7 @@ class BenchmarkDecodeArrow : public ::benchmark::Fixture {
   void TearDown(const ::benchmark::State& state) override {
     buffer_.reset();
     input_array_.reset();
+    values_.clear();
   }
 
   void InitDataInputs() {